2021 Fiscal Year Annual Research Report
Refined relic abundance calculations for thermal and non-thermal Dark Matter
Publicly Offered Research
| Project Area | What is dark matter? - Comprehensive study of the huge discovery space in dark matter |
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| Project/Area Number |
21H05452
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Binder Tobias 東京大学, カブリ数物連携宇宙研究機構, 特任研究員 (30847009)
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| Project Period (FY) |
2021-09-10 – 2023-03-31
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| Keywords | Dark Matter / relic abundance / bound-state formation / thermal field theory |
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| Outline of Annual Research Achievements |
The research purpose, as summarized in the proposal document "Refined relic abundance calculations for thermal and non-thermal Dark Matter" (March, 2021), was to explore theoretical uncertainties in the Dark Matter relic abundance prediction. In summary, the main research targets for the proposed topic about heavy WIMP production have been achieved in FY2021.
In particular, the research about Dark Matter bound state formation inside the early Universe plasma has been fruitful. The proposed (zero and finite temperature) next-to-leading order (NLO) computation of a non-abelian electric field correlator is completed and the results are published in a journal. Gauge invariance, collinear and infrared finiteness were proven. The main result in form of one-integral expressions can be used to study thermal corrections to singlet-adjoint pair transitions.
In a separate work, currently submitted to a journal, we studied an effective treatment of the coupled Boltzmann equations for an arbitrary number of bound states (and transitions). The result can straightforwardly be implemented into public relic density solvers such as DRAKE. As a part of the results, limiting expressions are also provided to bracket the impact of bound state transitions on the relic abundance without the need of computing any of those.
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| Research Progress Status |
翌年度、交付申請を辞退するため、記入しない。
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| Strategy for Future Research Activity |
翌年度、交付申請を辞退するため、記入しない。
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